PDP11/23+ goes on

For a real DEC Qbus PDP-11, the RQDX3 controller and an RX50 floppy drive might be an alternative. -- There are literally dozens of Qbus cards and vendors for disc and tape (Dilog, Emulex, et al.) with RL/RK/RM or MSCP emulation for MFM ESDI or SMD discs. Some of the less popular ones go fairly cheap on eBay. There has, of course, been talk off and on about IDE boards for Q and Unibus for a long time now. The RQDxx controllers are a bit clunky to use with their breakout panel if you aren't putting it into a box designed for it. I still say that the simplest thing to do is just to find a used Qbus MSCP SCSI conroller though.. If you can find someone scrapping Qbus microvaxen, they often have them hiding inside (that's where I got the ones that I have).